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Basic arrangement of spider eyes, viewed from above. Most spiders have eight eyes, which tend to be arranged into two rows of four eyes on the head region. The eyes can be categorised by their location and are divided into the anterior median eyes (AME), anterior lateral eyes (ALE), posterior median eyes (PME), and posterior lateral eyes (PLE).
Cosmophasis baehrae has the inner two forward looking eyes greatly enlarged, typical of the jumping spider family, Salticidae. Diagnostic for this species is a white bar on the carapace just behind the rearmost pair of eyes. [4] The body length of the male is 7 mm (0.28 in) and female 5 mm (0.20 in). [4]
Pashupatastra, an irresistible and most destructive personal weapon of Shiva and Kali, discharged by the mind, the eyes, words, or a bow. Varunastra, a water weapon (a storm) according to the Indian scriptures, incepted by Varuna. In stories it is said to assume any weapon's shape, just like water.
Caponiidae are unusual in the degree to which the eye number varies. In this they surpass even the family Cybaeidae in which some species have two eyes, some six, and some eight. In some species of the Caponiidae paired eyes meet in the midline, giving the spider in effect, an odd number of eyes. The following genera have eyes as follows:
The tapetum is a reflective layer at the back of the eye, thought to increase sensitivity in low light levels. Lycosoids were then defined by having a "grate-shaped" tapetum. Research from the late 1990s onwards suggests that this feature has evolved more than once, possibly as many as five times, [ 1 ] so that the original Lycosoidea is ...
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